Lathe



' l1,630,333 May 3l, 1927. VG. W. DUCHEMIN x LATHE Filed May 26, 1925 4sheets-shea. 2

Y INVENTOR. B .a

ATTOZEY May 3l, 1927.

v 1,630,333 ca.y w, DUCHEMIN LATHE Filed YMay 26, 1925 `4 sheets-Shen;

INVENTOR,

Y@ fh ,wml

l I ATTORYl May 31,1927.

G. W. DUCHEMIN vLATHE 4 shets-sheet 4 Filed May 26, 1925 1NVENToR.`

f Patentd Ma; 31; 19277.A f

t LATHEQJ Applie'ripnflea may 26, lnsfseriai No. 3,27*;896.

as 1an ,miele @i ,the y,sanne size Groff' a" Size.' langer or ,smallerthan .the pattfelnf'the ad ju'stnnentS'or-the KVarious sizes"-bengeasily 'f The invention ,further conslsts 1n ka struc! eratinnvfeasynnd'which has. sufficient rigidity in fthevclanses ,of 'the "claims means,which shaft 17s nfsed -Qp turning tn'e vwhich supports k,the,'z11ne`lltwhch jlfLLm/GS mounted so that it swings preferably' ,lnteiff Am1111111 .,@f its @n1-1S. andlshow Ithe bearings Y 11212111131 il?) .onthqlnmnl which beztrnlgs project andholdthe ,frame 11 so that 1t canmeans for holding-the r@Work V11p against Cll pattern wheel and Cnttngtools, theyie'lding having the Weight, lsf

ew of a "sliding snc'h Chucks at 19, these be'ngfndonnted,7 in

C11 Unk y supprt lbeng zuliangd Ato slide in th diffrent flengthsnfy111101111, the'WQrk bein-g means' :and

The lclhncks' fai-e Vopemtdv yfrom the vshafts and 373 alternatelythrughfthSliding Clutch 11; 21th@season-1611111111 reversal jjo1m0-ve--vy 'Y as' afsnpprt 'for th shadftl 3-11 The gen1? small one and" 'thegea-1' 1mi l Workman is 'usuallyattending Ythe machine to send vthechucksupport back toits start-y ingvr position' When thev Work iscompleted.V It Willi-thus lbe evident-that'atter the machineis startedthe chucksupport isjrecipro-- p cated to carry the Work 23'` past thecutters "48?usually oneztor eachlast, these cutters being `mounted onshafts 49V supported on the -befaring'plate 50 securedrto theupright,and driven by belts'l fromk the shaft 52 4The'shape of4 the Work is41determined by thepatternjlvwhich-'is in a, pattern chuck 575, this fpatternv chuck being mounted betweenthevvbars 5,6 and being slidablethereon so-that vithcan slide relative to the. l chuck frsupport,`either in the samedirectiongata greater speed or in the same directionat av slower 4speech according to'` Whether-*orfnot the' Work is to besmaller or largerzthan the pattern. v)Thispattern 511 can be fofrany'del' fsired vmaterial 'but is usually made of metal and isl kept inpthemachine: until all sizes this pattern have been made and'thenijtlieYpattern -ca'n be; changed,y f' Y dinV by the shaft 27 Whichl hasl asliding rotative tative motion land-the reproductionof the.` Y l ,WOIkiS -hSIGOlQ accurate comparedfto the" pattern.- i n 40" connection withthe gear 26vandis connected theretolp'bya connection show vn at V57which 30 is illustrated in rdetailin FigureV the gear V2.6havingfyavy"yoke-sh'aped fitrame 58,.into "j Whichfthe.slide'piece lits at itsends the slidelpieceQ being adjustable by the screw Oonthe shaft 27,`The fit of the end 610i the slide piece: v59 lis `tight'in the groove 62of the-frame 58 so that. there is no llostro- 'forth by abar 63 whichextends from theY pattern chuckto the end of' thechuck sup:

port 20 andis vmounted in a r bearing64fon 5 the'fendb'ar22 y.and in thebearing 65 on the.V

endV bar l2.1.V VIts movement is caused by' a 1 crossarm 66 ;to which itis fastened 'at the l `centre inline .ivitli-the-pivotal*connection 67`s of the toggles 68ewhich vareconnected bythe *Y pivotalpins 69 on theblocksifO/Vandzthe The toggles are slotted, as-atl andere; ceivev thepins72lvvhichare :part of the slide ing chuck support A20. so 'that asthe chuck.

support slides backand forth,V these toggles- '68 are svvung` togetherto the rightandleft j of the pivotV 67.. The movement 'of the-cross#yAarm 66however, is not always the same bev .cause the pivotal blocks 7 O-can be moved toywardanditrom'the Centre `67'by the lscrew 73 Whichisoperated by' a suitable handle 74. ltfwillthus beevident that Vwhen a,last

lisito be niadeflongenthan' the pattern the movement'of the patternmu'stbe less than fthe movementofthe Worlgthat i'rs,`,themove' f mentjoffthechuck" supportvvhichjcarri'es the lThepatternchuck isV niovedbackandwon@ and the; Sorge/73 is Operated taai the gauge'75 indicates -arelative size of the Work and the pattern 'at 'a point which Willliephetvveen the pivotal-pins 2 *and the centre. .v

'i It the vvorkis to be of thesame size the s `pattern,` the pins 69 and72 are in alignment andii the Workis to be shorterv than the pat tern,lthe patternv is vgiven excess"movement;,{A I l 'by moving theypivotal'points'-GQ Vbeyond the centres 72. e'lhislivillgive'anfeXcessthrow Yto the cross-arm(l 66as the pivotal connec-f4 ertion 67. of thetoggles` 68is-on thefcrOss-a'rmf 76 of the gate or frame11.

The Y.increase fori decrease, 'of' dial'fneterl of the s Work" relativeto the model is regulated 's by-the v'distance ofthe patternfand Work`,from the pivotal centreof swinging .move-1A ment of the gate 11. Thepositionof'the pattern can. be'shifted since; thefchuck v can bewmovedloa-ck'A and forth' in' 1 adjustment longitudinally when the screw 60 islfoosel'ied-Q` and"y it is set' in properlplace lforitspatterndy Wheel77 toV indicatefon' the scale 78V what thel Y,relative diameters off.-the various adjustj` ments will produce on' the ivorki Tlie patternWheels mounted' onv a eef bracket 79 adjustableffon'thebarfSOvvhich isfastenedfto` the upright'V l10j,"usually being made inthe` same piecewith' the support` or bracket'fl). The machines arefusuallyf soyconstructed that the` relativej inerease s or de# y crease in lengthVand thefrelativer increase or.k

decrease in diameter 'havethegsameinsigniatf"' l numbers lon" the ,scale'811011 the;`

orindicating ylt lvvill be', various' modi fi'- el ca tionfs'canAbe'made injlthe proportion anjdi t f formfofk the parts ofthestructurefwithout departingirom thef scope/Ot theinvention and to show'fsucli possible:l modifications i I l have A illustratedllin FigureV10'fthe"gate 11 provided With the sliding pattern .chuck-V55 f on oneside ofthecentre of the"pivotal:sup-V port :Eorth'e gate,k 'the Xfedchuck '1Q-being 1 shoivnpn thekk opposite side ofthe centre; the

pattern being movable through a considerable" distance'. along thelength n of fthe` supiV YI *i portee; Y It will lbe understood that boththe Work andthe pattern can` be move'djinV the chuck e support and Ishow in Figure'11 a meansY for producingsuch movementlby 'means ofthelink 841:0 lslide'the Work 23`an'd a linkB yto movement ofY they pattern4relative 'tot the We movement 'of the 'were Y Iclaim:V Y

pattern and 'Work .carrying chuck support-,on the gate, chucks onfitheVchuck :supports onone 1'. -AV 'lathe .for turning irregular `formscomprising la support,l agate swinging inter'fk vmediate its ends' onthe` support, asliding f side of the' pivot-,1a mechanismV for rotatingvthe chucks and vfor reciprocating the chuck 'support7 said mechanism.being mounted on the gate on' the other side of rthe-pvot, and a patternWheel and cuttersdispos'e'd so as to bear on pattern and Work in thechucks. l

2. A` lathe for turning Lirregular formsVA the gateon theother-'side' ofthe pivot, a pattern'Wheel-and cutters disposed so as to the chucks"andl for reciprocating the chuck support, -vsaid mechanism being mountedon bearon ypattern and Workin thev chucks, and f anadjustable means forvarying the distance of slidingtravel of one of vt-hechucks V'rela-v i.tive-to the other chucks.

In testimony aoooi oioiro uio -forogoi'ng I' have hereto setmy May,1925.-

hand this "6th day v0f; i GEOQW; DUCHEMINQ

